Betta Bilda was launched
by the UK plastic kit company AIRFIX in 1961 replacing its previous
and largely unsuccessful construction system. It is based on 1X2
bricks and 1X- beams of varying lengths, as well as thin plates
that are evident LEGO clones, as are the windows. Although very
similar to LEGO, the systems are not intermutable due to a slight
modular discrepance.

It must have been very successful
in its time (1960s-1970s) because it is still very common today
and since sets are liberally filled to capacity, it remains an option
for builders looking for large quantities of bricks and beams for
major projects.

Figure
1- Betta Bilda elements compared to a 1X2 red LEGO brick

Figure
2- The cover of a Betta Bilda #3 construction set incorporating over 1,000
parts

Figure
3- The inside of a new set showing the rather careless arrangement